From: Francis Deslauriers <[email protected]>
Signed-off-by: Francis Deslauriers <[email protected]>
---
src/bin/lttng/commands/add_context.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/bin/lttng/commands/add_context.c
b/src/bin/lttng/commands/add_context.c
index 405b782..52d0db4 100644
--- a/src/bin/lttng/commands/add_context.c
+++ b/src/bin/lttng/commands/add_context.c
@@ -514,6 +514,9 @@ static void usage(FILE *ofp)
fprintf(ofp, " TYPE can be one of the strings
below:\n");
print_ctx_type(ofp);
fprintf(ofp, "\n");
+ fprintf(ofp, "Note that the vpid, vppid and vtid context types
represent the virtual process id,\n"
+ "virtual parent process id and virtual thread id as
seen from the current execution context\n"
+ "as oppose to the pid, ppid and tid that are kernel
internal data structures.\n\n");
fprintf(ofp, "Example:\n");
fprintf(ofp, "This command will add the context information 'prio' and
two per-cpu\n"
"perf counters (hardware branch misses and cache
misses), to all channels\n"
--
1.8.3.2
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